Explanation:

- Option 1: Curse

- This isn't scientifically accurate. Motion isn't inherently negative or a curse.

- Option 2: Exhaustive

- Some motion is exhausting, but scientifically, it's not a defining property.

- Option 3: Counterproductive

- Motion isn't counterproductive. It's essential to the natural world and mechanics.

- Option 4: Relative

- Correct Answer: In physics, all motion is relative to a frame of reference. This means movement is described in relation to something else. Motion can vary greatly depending on this frame of reference.